"Clearly, it was a cowardly act of terrorism and the Prime Minister, I commend her for coming out strong and saying, 'listen, there's no place for that here,' and I agree with her," Brown said in a phone interview with NBC10 Boston.

Warren mentioned Charleston and Pittsburgh during her condolences. The Massachusetts senator said "everyone should have the right to worship without fear.

Charleston, Pittsburgh, and now Christchurch. Everyone should have the right to worship without fear, and an attack on a place of worship is terrorism perpetrated against all of us. My heart goes out to the people of New Zealand today.

"I promise to continue working tirelessly to put an end to this public health crisis," she said.

49 lives stolen from this earth because of a senseless, hateful, islamaphobic act of terrorism in a place of worship. The longer we wait to regulate the gun industry, the more lives we will lose. I promise to continue working tirelessly to put an end to this public health crisis.

The Islamic Society of Boston and Cambridge Police Department, which serves the city with the largest mosque in the greater Boston area, also responded to the tragedy.

ISB said their prayers are with the Muslim community in New Zealand. In wake of the tragedy, increased security will be offered for Friday's prayer. The society said it is working with Cambridge police to ensure the safety of worshippers.

Massachusetts State Police said they are also continuing to monitor developments in the New Zealand mosque attacks. They said at this time there are no credible threats to any mosques or other houses of worship in Massachusetts.

The Cambridge Police Department is deeply saddened and troubled by the deadly violence that occurred earlier today in New Zealand. We, along with all of our brothers & sisters in law enforcement, grieve the lives that have been affected and lost as a result of this mass violence.